Wow no Unlock Code ??!??!Support

Yesterday i receive a brand new "newer turned on" Sony Ericsson X10a loked on Rogers so I'm on Fido and i try to unlock it ...Unlock by imei
1- i try swiftunlocks
They send me Unlock Code - 4835145929415781 doesn't work (5 times left )
i try them before with my previous x10a and they were perfect !!!

Yes this is my second x10a because i have problem with previous one (just died one night left for charging)...and i have to send it to SONY ERICSSON service center and they send me this one. I have never try rodgers sim card on it i just insert my fido and unlock sim menu just pop up when i start the phone ...
> Phone is locked on Rogers i want to unlock it <
Can any body help me to unlock my phone by IMEI or any idea ???
Can those guys from SONY ERICSSON service center did something unusual ?